arch/sim/src: Add a special file system for use with simulator that supports access to the host file system from the simulation.  From Ken Petit

Small bug fix for stm32 lower half timer driver

Added implementation to get 96-bit stm32 unique id

Added a lower-half timer driver for stm32 which is compatible with the upper-half driver located at /drivers/timers/timer.c

Added a lower-half timer driver for stm32 which is compatible with the upper-half driver located at /drivers/timers/timer.c

arch/arm/src/samv7: Add pin configuratinos for SAME70.  Not all verified.  I assume that the SAME70 pin mapping is identical to the SAMV71 minus MediaLB pins

SAMV7: Don't call can_txdone with the device locked.  This can lead to deadlocks on subsequent actions from the upper half can driver

Fix typo

forgotten changes

Review of previous commit for coding style.  Tickless RIT logic still does not follow naming conventions or file format rules